// Copyright 2008 Harish Krishnaswamy
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package gwtBlocks.shared.models;

/**
 * This model binds a single value held in this model to a single property in the domain object held by the contained
 * bean model.
 * 
 * @author hkrishna
 */
public abstract class PropertyBindingModel<V> extends InputModel<V>
{
    protected PropertyBindingModel(String key, CompositeModel<?> parent)
    {
        super(key, parent);
    }

    @Override
    public void parentValueChanged()
    {
        super.parentValueChanged();

        if (getParent().getValue() == null)
            setValue(null);
        else
            setValue(getPropertyValue());
    }

    /**
     * This method will commit the value in this model to the domain object.
     */
    public void commit()
    {
        if (getParent().getValue() != null)
            setPropertyValue();
    }

    /**
     * This method will be generated by BeanBindingModelGenerator during GWT's rebind phase.
     */
    protected abstract void setPropertyValue();

    /**
     * This method will be generated by BeanBindingModelGenerator during GWT's rebind phase.
     */
    protected abstract V getPropertyValue();
}
